FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_dinode.h

     /*-
      * Copyright (c) 2009 Aditya Sarawgi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _FS_EXT2FS_EXT2_DINODE_H_
    #define _FS_EXT2FS_EXT2_DINODE_H_
    
    /*
     * Special inode numbers
     * The root inode is the root of the file system.  Inode 0 can't be used for
     * normal purposes and bad blocks are normally linked to inode 1, thus
     * the root inode is 2.
     * Inode 3 to 10 are reserved in ext2fs.
     */
    #define EXT2_BADBLKINO          ((ino_t)1)
    #define EXT2_ROOTINO            ((ino_t)2)
    #define EXT2_ACLIDXINO          ((ino_t)3)
    #define EXT2_ACLDATAINO         ((ino_t)4)
    #define EXT2_BOOTLOADERINO      ((ino_t)5)
    #define EXT2_UNDELDIRINO        ((ino_t)6)
    #define EXT2_RESIZEINO          ((ino_t)7)
    #define EXT2_JOURNALINO         ((ino_t)8)
    #define EXT2_EXCLUDEINO         ((ino_t)9)
    #define EXT2_REPLICAINO         ((ino_t)10)
    #define EXT2_FIRSTINO           ((ino_t)11)
    
    /*
     * Inode flags
     * The system supports EXT2_IMMUTABLE, EXT2_APPEND and EXT2_NODUMP flags.
     * The current implementation also uses EXT3_INDEX, EXT4_EXTENTS and
     * EXT4_HUGE_FILE with some restrictions imposed by the lack of write
     * support.
     */
    #define EXT2_SECRM              0x00000001      /* Secure deletion */
    #define EXT2_UNRM               0x00000002      /* Undelete */
    #define EXT2_COMPR              0x00000004      /* Compress file */
    #define EXT2_SYNC               0x00000008      /* Synchronous updates */
    #define EXT2_IMMUTABLE          0x00000010      /* Immutable file */
    #define EXT2_APPEND             0x00000020 /* Writes to file may only append */
    #define EXT2_NODUMP             0x00000040      /* Do not dump file */
    #define EXT2_NOATIME            0x00000080      /* Do not update atime */
    #define EXT3_INDEX              0x00001000      /* Hash-indexed directory */
    #define EXT4_IMAGIC             0x00002000      /* AFS directory */
    #define EXT4_JOURNAL_DATA       0x00004000 /* File data should be journaled */
    #define EXT4_NOTAIL             0x00008000 /* File tail should not be merged */
    #define EXT4_DIRSYNC            0x00010000      /* Dirsync behaviour */
    #define EXT4_TOPDIR             0x00020000 /* Top of directory hierarchies*/
    #define EXT4_HUGE_FILE          0x00040000      /* Set to each huge file */
    #define EXT4_EXTENTS            0x00080000      /* Inode uses extents */
    #define EXT4_EA_INODE           0x00200000      /* Inode used for large EA */
    #define EXT4_EOFBLOCKS          0x00400000 /* Blocks allocated beyond EOF */
    #define EXT4_INLINE_DATA        0x10000000 /* Inode has inline data */
    #define EXT4_PROJINHERIT        0x20000000 /* Children inherit project ID */
    
    /*
     * Definitions for nanosecond timestamps.
     * Ext3 inode versioning, 2006-12-13.
     */
    #define EXT3_EPOCH_BITS 2
    #define EXT3_EPOCH_MASK ((1 << EXT3_EPOCH_BITS) - 1)
    #define EXT3_NSEC_MASK  (~0UL << EXT3_EPOCH_BITS)
    
    #define E2DI_HAS_XTIME(ip)      (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \
                                        EXT2F_ROCOMPAT_EXTRA_ISIZE))
    #define E2DI_HAS_HUGE_FILE(ip)  (EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, \
                                        EXT2F_ROCOMPAT_HUGE_FILE))
    
    /*
     * Constants relative to the data blocks
     */
    #define EXT2_NDIR_BLOCKS                12
    #define EXT2_IND_BLOCK                  EXT2_NDIR_BLOCKS
    #define EXT2_DIND_BLOCK                 (EXT2_IND_BLOCK + 1)
    #define EXT2_TIND_BLOCK                 (EXT2_DIND_BLOCK + 1)
    #define EXT2_N_BLOCKS                   (EXT2_TIND_BLOCK + 1)
   #define EXT2_MAXSYMLINKLEN              (EXT2_N_BLOCKS * sizeof(uint32_t))
   
   /*
    * Structure of an inode on the disk
    */
   struct ext2fs_dinode {
           uint16_t        e2di_mode;      /*   0: IFMT, permissions; see below. */
           uint16_t        e2di_uid;       /*   2: Owner UID */
           uint32_t        e2di_size;      /*   4: Size (in bytes) */
           uint32_t        e2di_atime;     /*   8: Access time */
           uint32_t        e2di_ctime;     /*  12: Change time */
           uint32_t        e2di_mtime;     /*  16: Modification time */
           uint32_t        e2di_dtime;     /*  20: Deletion time */
           uint16_t        e2di_gid;       /*  24: Owner GID */
           uint16_t        e2di_nlink;     /*  26: File link count */
           uint32_t        e2di_nblock;    /*  28: Blocks count */
           uint32_t        e2di_flags;     /*  32: Status flags (chflags) */
           uint32_t        e2di_version;   /*  36: Low 32 bits inode version */
           uint32_t        e2di_blocks[EXT2_N_BLOCKS]; /* 40: disk blocks */
           uint32_t        e2di_gen;       /* 100: generation number */
           uint32_t        e2di_facl;      /* 104: Low EA block */
           uint32_t        e2di_size_high; /* 108: Upper bits of file size */
           uint32_t        e2di_faddr;     /* 112: Fragment address (obsolete) */
           uint16_t        e2di_nblock_high; /* 116: Blocks count bits 47:32 */
           uint16_t        e2di_facl_high; /* 118: File EA bits 47:32 */
           uint16_t        e2di_uid_high;  /* 120: Owner UID top 16 bits */
           uint16_t        e2di_gid_high;  /* 122: Owner GID top 16 bits */
           uint16_t        e2di_chksum_lo;   /* 124: Lower inode checksum */
           uint16_t        e2di_lx_reserved; /* 126: Unused */
           uint16_t        e2di_extra_isize; /* 128: Size of this inode */
           uint16_t        e2di_chksum_hi; /* 130: High inode checksum */
           uint32_t        e2di_ctime_extra; /* 132: Extra change time */
           uint32_t        e2di_mtime_extra; /* 136: Extra modification time */
           uint32_t        e2di_atime_extra; /* 140: Extra access time */
           uint32_t        e2di_crtime;    /* 144: Creation (birth)time */
           uint32_t        e2di_crtime_extra; /* 148: Extra creation (birth)time */
           uint32_t        e2di_version_hi;  /* 152: High bits of inode version */
           uint32_t        e2di_projid;    /* 156: Project ID */
   };
   
   #endif /* !_FS_EXT2FS_EXT2_DINODE_H_ */
   

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